<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <style>
        .c1{
            width: 19.8vw;
            height: 5vw;
            background-color: #0a53be;
        }

        .c2{
            width: 60vw;
            height: 5vw;
            background-color:rebeccapurple;
            margin: 0 0.2vw;
        }


        .c3{
            width: 19.8vw;
            height: 5vw;
            background-color:greenyellow;
        }

        .line1{
            line-height: 4.5vw;
            text-align: center;
            float: left;
        }


        .line1::after {
            content: '';
            display: block;
            clear: both;

        }


        html, body {
            height: 100%;
            margin: 0;
        }

        .root {
            width: 100vw; /* 使用视窗宽度单位，占据全屏宽度 */
            height: 100vh; /* 使用视窗高度单位，占据全屏高度 */
            margin: 0;
            background-color:black;
        }

    </style>
</head>

<body>

<div class="root">
<div class="line1">
    <div class="line1 c1">logo</div>
    <div class="line1 c2">banner1</div>
    <div class="line1 c3">banner2</div><!-- <div class="mofa"></div> -->
</div>
<div class="line2">4</div>

<div class="line3 menu">
</div>





</div>

</body>
</html>